linux-kernel - Re: [PATCH v14 28/56] media: nxp: Stop direct calls to queue num

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Date:   Thu, 9 Nov 2023 11:26:40 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com, Rui Miguel Silva <rmfrfs@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Martin Kepplinger <martink@...teo.de>
Subject: Re: [PATCH v14 28/56] media: nxp: Stop direct calls to queue
 num_buffers field

W dniu 31.10.2023 o 17:30, Benjamin Gaignard pisze:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>

Reviewed-by: Andrzej Pietrasiewcz <andrzej.p@...labora.com>

> CC: Rui Miguel Silva <rmfrfs@...il.com>
> CC: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> CC: Martin Kepplinger <martink@...teo.de>
> ---
>   drivers/media/platform/nxp/imx7-media-csi.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/nxp/imx7-media-csi.c b/drivers/media/platform/nxp/imx7-media-csi.c
> index 15049c6aab37..4c467fb82789 100644
> --- a/drivers/media/platform/nxp/imx7-media-csi.c
> +++ b/drivers/media/platform/nxp/imx7-media-csi.c
> @@ -1245,6 +1245,7 @@ static int imx7_csi_video_queue_setup(struct vb2_queue *vq,
>   				      struct device *alloc_devs[])
>   {
>   	struct imx7_csi *csi = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   	struct v4l2_pix_format *pix = &csi->vdev_fmt;
>   	unsigned int count = *nbuffers;
>   
> @@ -1254,14 +1255,14 @@ static int imx7_csi_video_queue_setup(struct vb2_queue *vq,
>   	if (*nplanes) {
>   		if (*nplanes != 1 || sizes[0] < pix->sizeimage)
>   			return -EINVAL;
> -		count += vq->num_buffers;
> +		count += q_num_bufs;
>   	}
>   
>   	count = min_t(__u32, IMX7_CSI_VIDEO_MEM_LIMIT / pix->sizeimage, count);
>   
>   	if (*nplanes)
> -		*nbuffers = (count < vq->num_buffers) ? 0 :
> -			count - vq->num_buffers;
> +		*nbuffers = (count < q_num_bufs) ? 0 :
> +			count - q_num_bufs;
>   	else
>   		*nbuffers = count;
>